# 要求：使用for和range打印一个九九乘法表
# 1 * 1 = 1
# 1 * 2 = 2    2 * 2 = 4
# 1 * 3 = 3    2 * 3 = 6    3 * 3 = 9
# 1 * 4 = 4    2 * 4 = 8    3 * 4 = 12   4 * 4 = 16
# 1 * 5 = 5    2 * 5 = 10   3 * 5 = 15   4 * 5 = 20   5 * 5 = 25
# 1 * 6 = 6    2 * 6 = 12   3 * 6 = 18   4 * 6 = 24   5 * 6 = 30   6 * 6 = 36
# 1 * 7 = 7    2 * 7 = 14   3 * 7 = 21   4 * 7 = 28   5 * 7 = 35   6 * 7 = 42   7 * 7 = 49
# 1 * 8 = 8    2 * 8 = 16   3 * 8 = 24   4 * 8 = 32   5 * 8 = 40   6 * 8 = 48   7 * 8 = 56   8 * 8 = 64
# 1 * 9 = 9    2 * 9 = 18   3 * 9 = 27   4 * 9 = 36   5 * 9 = 45   6 * 9 = 54   7 * 9 = 63   8 * 9 = 72   9 * 9 = 81